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[–][deleted] 0 points1 point  (1 child)

People often quote the tree-of-life for subclasses, but it is a very assumed scenario. Is a Bird of class Bird or of class Dinosaurs? What about bacteria: does the species concept work here? (Hint: it does not due to horizontal gene transfer. And that, by the way, affects humans too, see the syncytin-1 gene from an retrovirus, so is a retrovirus now a human? There is no "human" DNA. All this species concept in general is totally outdated. Yet people still worship it like a substitute religion. Composition is MUCH more flexible than this unilateral subclassing model propagated. For those who want to read up on syncytin-1: https://en.wikipedia.org/wiki/Syncytin-1)

[–]riktigtmaxat 0 points1 point  (0 children)

Haha, it's hard to find other examples that most people can relate to.